Increase your ISO. Typically shots taken indoors without any flash require an ISO setting in the neighborhood of 800-1600 (or higher) in order to get decent handholding shutter speeds. ISO 200 is too low for these kinds of shots.
You could also increase the aperture (if your lens will let you, which in this case it won't much, as the 55-250IS has a f/4-5.6 max. aperture), use a tripod with a longer shutter speed, or add flash, but if you just want to shoot handheld, you need to increase the ISO and watch the shutter speed.
See also: "What is the exposure triangle?"
Also be aware that without stabilization there's an old film-era rule of thumb that your shutter speed should be faster than 1/focal_length to mitigate camera shake blur. So, if you use your lens at 200mm, that would mean 1/200s or faster. ISO can reduce this, but because of the high pixel densities in dSLRS, some folks would advocate throwing in the crop factor (1/320s) or doubling (1/400s) that figure. So, if you're handholding, 1/25s with a telephoto zoom like the 55-250 could well mean you'll get camera shake blur as well.